norteey



2 Sheets-Sheet 1.

(No Model.)

T.NORT-HEY.

STEAM AGTUATED VALVE.

Patented 001:. 30, 1883.

IWOR.

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(No Model.) 2 Sheets-Sheet 2 T. NORTHEY; I

STEAM AGTUATED VALVE.

No. 287,706. atented 00F. 30, 1883.

ATTORNEYS.

N. PETERS Phmo-Lnho n hu, Washin ton, D. c.

I UNITED Y STATES PATENT Orrrcn. Q

THOMAS NORTHEY, OF TORONTO, ONTARIO, CANADA.

STEAM-.ACTUATED VALVE.

srncrrrchrron forming make and use the same, reference being bad to the accompanying drawings, which fprm a part of this specification, and in which Figure 1 is a longitudinal vertical section of a steam-cylinder andsteam-chest, showing the valve in position in the middle of the steam-chest or on the half-stroke. Fig. 2 is a vertical cross-section through the middle of the cylinder, valve, and steam-chest. Fig. 3 is a horizontal sectional view through line ac, Fig. 1, looking downward. Fig. 4 is a plan View of the bottom of the steam-chest which constitutes the valve-seat, and Fig. 5 is a plan view of the under sideof the slide-valve. I

Similar letters of reference indicate corresponding parts in all the figures.

My invention has relation to steam-actuated valves, adapted more particularly to steamengines as applied to steam-pumps; and the object of my invention is to so construct the valve that it may be operated with absolute certainty, and with a minimum of wear and friction by the steam it admits into the cylinder, and without'the intervention of any mechanical contrivance. In other words, my improved steam-actuated slide-valve is a balanced valve, which is operated by the direct action of the steam on the valve, and without the intervention of a plunger or other intermediate mechanism.

In the accompanying drawings, A represents the steam-cylinder, and: B the piston.

D and D are the usual steam-ports, which extend from each end of the cylinder to the steam-chest O.

F and F are auxiliary steam-ports, communicating between the interior of the cylinder and the interior of the steam-chest on opposite sides of the main ports D and D. By

arranging the auxiliary ports on opposite sides communicates, in the usual manner, with the part of Letters Patent No. 287,706, dated October 30,1883. Application filed August 15 1883. (No model.) I

of the main ports, it will be seen that the former do not come in contact with or otherwise interfere with the'latter.

' E is the ordinary exhaust-port, which is formed in the bottom of the steam-chest, and

exhaust-port E in the valve.

My improved steamaetuated balanced slidevalve has three compartments-via, a central chamber, E, and the end chambers, M and M, one at each end; and the live steam is fed into the central chamber from the throttle-valve,

below the center of the slide-valve,.through the steam-ports J A small steam-channel, R, is cut through the top of the central chamber or compartment, E, opening up into a steam-chamber, S, located in the top part of the steam-chest, so that the steam fed into chamber S will exercise a downward pressure upon the body of. the valve, irrespective of its position in the steam-ches't, which will equalize or balance the upward pressureon the valve caused by the steam admitted to its inside and from the cylinder. The valve is provided on its under side with the steam: 7 5' ports G and G, through which steam may be fed from the cylinder, by way of the auxiliary steam-ports F and F, into opposite ends of the steam-chest, for the purpose of reciprocating the valve. The valve is further provided with exhaust-ports P and P, which are so located as to operate in conjunction with their corresponding ports, Q and Q) in the steam-chest, which said ports Q and Q communicate with the general exhaust. i

As represented in Fig. 1 of the drawings, the piston is shown at the end of its righthand stroke, and the valve is in the midway position in the steam-chest, with all the ports closed except the exhaust. As the piston starts on the return-stroke, actuated by the initial steam-pressure, the valve will be in position to cut off communication with the auxiliary steam-port F and with the cylin der, and the cylinder will exhaust through ports'D' and F. When the piston has passed the auxiliary port F on its stroke from right to left, the valve will have reached-the end of its left-hand stroke, and the steam admitted into the steam-chest through the auxiliary 160.

and the corresponding port, H, in the bottom of the steam-chest into the left-hand end of the latter, where it operates to shift the valve.

to the other end of the steam-chest, ready to effect the return-stroke of the piston. As the valve slides from left to right in the steamchest, the ports P and Q will gradually cover and open communication with each other at the end of the stroke, but not before, thus exhausting the steam by which the valve was actuated on the right-hand stroke through the port N, chamber M, port 1, port Q, and the general exhaust, with which the latter port communicates. The valve will exhaust in like manner, at the end of its return-stroke from right to left, through the port N, chamber M, valve-port P, and the port Q in the steam chest, which communicates with the general exhaust the same as the corresponding port, Q, in the other end of the chest.

In order to give the valve proper momentum to initiate its strokes, it may be loaded by in troducing fine shot into the end chambers, M and M, and after the proper gravity has been attained the shot is melted down upon the bottom of the valve, so as to remain perma nently in position; and in order to prevent undue jarring of the valve as it reciprocates in the steam-chest, the latter may be provided at opposite ends with suitable cushions, a and a.

Having thus described my invention, I do not claim, broadly, a steam-actuated valve operated by the direct action of the steam it admits into the steam-cylinder; but

Vhat I claim as my improvement, and desire to secure by Letters Patent of the United States, is

1. The triple-chambered slide-valve composed of the central compartment,'E, having exhaust-port E, live-steam port J, and steamchannel R, and the end compartments, M and M, provided, respectively, with the ports G N P and G N P, constructed and arranged substantially as and for the purpose shown and set forth.

2. The triple-chambered slide-valve E M M, having end apertures, N and N, whereby the chambers M and M, located at opposite ends of the valve, may be loaded with a weight to properly regulate its momentum, substantially as set forth.

3. The combination of the steam-cylinder A, having exhaust E main ports D D, and auxiliary ports F F, a valve-seat having ports cut through it corresponding to and communicating with the cylinder ports, the steamchest having the steanrchamber S, live-steam ports H H, and ports Q Q, communicating with the general exhaust, and the triple-chambered slide-valve having central compartment, E, provided with the live-steam port J, exhaust and steam-channel R, and end compartments, M and M, provided, respectively, with the ports G N P and G N P, the whole constructed and combined to operate substantially in the manner and for the purpose herein shown and set forth.

In testimony that I claim the foregoing as my own I have hereunto aifixed my signature in presence of two witnesses.

THOMAS NORTHEY.

Vitnesses:

LOUIS BAGGER, AUGUST PETERSON. 

